A Schweinehaufen is a group of people lying upon each other like a bunch of pigs.
It mostly happens when somebody lies unaware on the ground and another persons shouts "Schweinehaufen!". Then all people knowing what it means run and jump onto the lying person.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed